 /*******************************************************************************
  * Copyright (c) 2006, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.core.databinding.observable;

 /**
  * @since 1.0
  *
  */
 public abstract class ChangeSupport extends ChangeManager {

     /**
      * @param realm
      */
     public ChangeSupport(Realm realm) {
         super(realm);
     }
     
     public void addListener(Object listenerType,
             IObservablesListener listener) {
         super.addListener(listenerType, listener);
     }
     
     public void removeListener(Object listenerType,
             IObservablesListener listener) {
         super.removeListener(listenerType, listener);
     }
     
     public void fireEvent(ObservableEvent event) {
         super.fireEvent(event);
     }
     
     /**
      *
      */
     protected abstract void firstListenerAdded();
     
     /**
      *
      */
     protected abstract void lastListenerRemoved();

     /**
      * @param listener
      */
     public void addChangeListener(IChangeListener listener) {
         addListener(ChangeEvent.TYPE, listener);
     }
     
     /**
      * @param listener
      */
     public void removeChangeListener(IChangeListener listener) {
         removeListener(ChangeEvent.TYPE, listener);
     }

     /**
      * @param listener
      */
     public void addStaleListener(IStaleListener listener) {
         addListener(StaleEvent.TYPE, listener);
     }
     
     /**
      * @param listener
      */
     public void removeStaleListener(IStaleListener listener) {
         removeListener(StaleEvent.TYPE, listener);
     }
     
 }

